RCBS Steel Neck Bushings are designed to provide the right tension on the bullet with RCBS Gold Medal Match sizing dies, enhancing accuracy and prolonging case life.
For optimal alignment and results, it is recommended to use high-quality brass with consistent neck thicknesses, and the bushings require traditional case lubrication as they come bare steel.
To select the correct bushing size, subtract .002"-.003" from the loaded cartridge's outside neck diameter or calculate by adding twice the neck wall thickness to the bullet's diameter and then subtracting .002"-.003".